- postural hypotesion
 - postural drainage
 - parathyroid hormone
 - parathormone
 - protirelin
 - panhypopituitary dwarfism
 - psychoneurotic anxiety state
 - prolepsis
 - paralepsis
 - paregmenon
 - polysyndeton
 - paraleipsis
 - plexus hypogastricus
 - prognathic
 - prognathous
 - portland cement
 - pH
 - pH scale
 - planula
 - pistia
 - Pistia stratoites
 - Pistia stratiotes
 - Proteles cristata
 - pismire
 - psychrometer
 - polydactyly
 - polyhidrosis
 - pine_weed
 - pineweed
 - presbyopia
 - plural
 - peptide
 - proteolytic activity
 - preponderance
 - prosopopoeia
 - pooh_bah
 - physical surrender
 - pelvic arch
 - pelvic girdle
 - pectoral girdle
 - preposterous times
 - passive
 - plant hopper
 - pleistocene
 - pleistocene epoch
 - polar body
 - peach blight
 - parfait
 - Piedmont type of glacier
 - pogonophora